package com.chen.regie.filter;


import com.alibaba.fastjson.JSON;
import com.chen.regie.common.BaseContext;
import com.chen.regie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登陆
 */
@Slf4j
@WebFilter(filterName = "logCheckFilter",urlPatterns = "/*")

public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1，获取本次请求URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2，判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3，如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //4-1，判断登录状态，如果已经登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为：{}，",request.getSession().getAttribute("employee"));


            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
//
//            long id  = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);
            filterChain.doFilter(request, response);

            return;
        }

        //4-2，判断登录状态，如果已经登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}，",request.getSession().getAttribute("user"));


            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
//
//            long id  = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);
            filterChain.doFilter(request, response);

            return;
        }

        log.info("用户未登录");
//        5，如果未登录则返回未登录结果,通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString((R.error("NOTLOGIN"))));
            return;
//            log.info("拦截到请求:{}",request.getRequestURI());
//            filterChain.doFilter(request,response);
        }
    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
            for (String url : urls){
                boolean match = PATH_MATCHER.match(url,requestURI);
                if(match){
                    return true;
                }
            }
            return false;
    }
}
